An international rule of law complementing modern states' domestic rule of law seems to be emerging. At least in the four issue areas of international law considered here – international trade, security, labour, and environmental law – empirical evidence suggests that relevant dispute settlement procedures have been judicialized and their use by complainants as well as their acceptance by defendants have increased in practice. Albeit still far from what we are used to from the domestic rule of law, the emergence of an international rule of law can be regarded as indicative of a fundamental transformation of modern states.